<!-- 写html -->
<template>
    <div class="app">
        <h1>Hello Vue!</h1>
    </div>
</template>

<!-- 写js或ts -->
<script lang="ts">
export default{
    name:'App'  //组件名
}
</script>

<!-- 写css -->
<style>
.app{
    background-color: aquamarine;
    box-shadow: 0 0 10px;
    border-radius: 10px;
    padding: 20px;
}
</style>